At a site in Dorchester, DePaola showed Gov. Charlie Baker and reporters the new third rail that workers have been laying down on the above-ground portion of the Red Line’s Braintree branch. The new third rail has a small curvature on its top, so there won’t be a build-up of ice and snow that caused problems for trains last winter. The MBTA is also replacing switch heaters. For the full story, click here.